Welded joint.



L. S. SCHMIDT.

WELDED JOINT.

APPLICATION FILED DEC. 15. I914.

Patented Oct. 26, 1915.

FIG].

.FJG4. FIG. 5.

g 15 13 J2 J4 V v I F16 6. 5mg? FIGS. 34 I FJGQ WITNESSES WWW STATES PATENT osmosmwnnncn s. SCHMIDT, or CORAOPOLIS, PENNSYLVANIA, Rosoon nmcconmcx, OF IRWIN, 2mm

' To all whom z't may concerni.

. edge portions Goraopolis,

State of Pennsylvanla, have Invented a new in'Welded Jolnts,

. Be it known that I, LAWRENCE S. SCHMIDT,

a citizen of the United States, residing at in'the county of Allegheny and and useful. Improvement of'which the followingis'a full, clealg, and exact-description, reference being had to the accompanying drawings, formlng part of this specification, in which Figure 1 is a plan View of a portion of a welded structure having joints made in accordance-with my invention. Fig. 2 1s a detail sectional view through one of the joints, taken on the' line IIII.of Fig. 1.

.3, is a similar View, modified form of joint,-and

Figs. 4, 5, 6, 7, views showing various joint' My invention has-relation to welded joints and is designedto provide a joint of this character which will have a maximum 8 and 9 are plan modifications of the strength by reason of the fact that at least a portion of the metal forming'the jOlIli'? 1s v in compression, instead of in tension, under stresses tending to separate the joint. I accomplish this object by so constructing the of the parts to be united that certain portions of one of the pieces will overlie or la'p complementary portions of the other piece in such a manner that the interposed filling constituting the joint is placed in compression.

My invention is subjectjto varioiis modifie'ations, in its .details, and some of the forms "thereof will nowbe described.

In Fig. 11 have shown a part of a structure formed ofa number of separate metal ,50 sheets, the adjacent joint-forming edges.

. is formed with the adjacent-edges of plates or sheets 2 united by welded joints 3. The welding edge 'of each plate-I or sheet 2 Y a series of alternating dovetailed project-ions 4: and recesses 5, the projections 4 of one sheet fitting loosely within the recesses of the other sheet, in the manner shown, with a sufficient space 6 between the parts toreceive which is flowed in'in as by the oxy-acetythe filling material 7 may be scarfed or beveled as indicated at 8 in Fig. 2 to form a trough to receive the .WELDED mm.

tailed sides of adjacent interfitting but showing a AssIenoR or ONE-HALF o YLvAnm.

filling. .With thicker plates the beveling may be from each side toward the center, as indicated at 9 in F ig. 3-, and filling metal 10 flowed in from both sides.

It will be readily seen that that portion of the filling metal between the dov projections will be under compression when subject to stresses tending to separate the joint. This,'of course, greatly increases the strength and the efliciency of the joint, and enables a joint to be made whose strength will approximate that of the metal itself, since the filling metal used may be of substantiallythe same character as the metal of which the welded parts areconstituted.

In th'elmodification interfitting projections are, of ,T-fo'rm;

.In the modification shown in Fig. 5 the projections 13'and recesses l l are of general T or headed form, but with the incurved surfaces 15 at the sidesthereof.

In the construction shown in Fig. 6 the projections 16 and recesses 17 have corrugated lateral edges or walls, as shown at 18.

Fig; 'Z shows a modification'in which the edge portions of each of the sheets to be 11 and recesses 12 [Welded are formed with dovetailed recesses of the joint.

Fig. 8 shows a form in which the projections 21 and recesses 22 are generally similarto those shown in Fig. 1, but witha much greater angularity of their sloping sides; Whereas in- Fig. 9 the corresponding projections 23 and recesses 2% have a com paratively slight angularity and are capable of being applied to eachother edge to edge. Thatis to say,'the recesses are sufi'icien'tly larger than the latter ;to be ins cess'es.

\ Patented Oct. 26, 1915. I

projections to permit the rted endwise into the reshown in Fig. 4: the

invention is susceptible to various other modifications in the form of interfitting recesses and projections, the object in each case being to increase the strength of the joint by reason of thelarge increase in i the shearing area due to the,irregular form of j oint My invention is applicable generally to a large class of welding operations and gives a greatly superior joint.

I claim:

1. A welded joint in which the parts united by the weld have interfitting portions extending across the general .line of the joint, and an interposed filling material between and welded to the adjacent edges of said portions, substantially as described.

2. A welded joint in which the parts unitedby the weld have interfitting portions extending across the general line of the joint, and an interposed filling material extending continuously between and welded to the-adjacent edges of said portions, substantially as described.

3. A. welded joint in which the parts.

united by the weld have interfitting portions extending across the general line of the joint, and an interposed filling material between andv welded to the adjacent edges of said portions, said interfitting portions having complementary dovetailed or undercut edges, substantially as described.

LIA Welded joint in which the parts united by the weld have interfitting portions extending across the general line of the joint, and an interposed filling material between and Welded to the adjacent edges of said portions, the edges of said interfitting portions being scarfed to form troughlike cavities for the reception of said filling material, substantially as described.

5. A butt-welded joint in which the united edges of the parts have interfitting portions extending across the general line of the joint, said portions being initially separated from each other and united by a filling material which fills the space between and is welded to said edges, said interfitting rccesses and projections being dovetailed, sub.- stantiallyas described.

In testimony whereof, I have hereunto set my hand.

. L. S. SCHMIDT.

\Vitnesses:

GEO. B. BLEMING, GEO. H. PARMELEE. 

